Here is a question for you H alpha men out there.
If you look at many published solar H alpha images, you see the character of the disc as a series of swirly lines.
Here is a typical example from Daytstar’s web-site:
If you look at the GONG images, you never see any character like this. I tend to regard GONG images as definitive as they have a band-width of 0.4 Angstroms centred at 6562.8 Angstroms. The GONG images are usually “mottled”, but never have the general swirls as in the image above. It looks nice, but where does the swirly stuff come from?
I have never seen this kind of character, and in fact my images such as the most recent one I posted: (https://roslistonastronomy.uk/window-sill-back-in-action) tend to be similar to the GONG ones. In fact, the only time I got anything like the swirls was when autostakkert was playing up!
Anyone any ideas?